.bigbox{
    width: 1100px;
    height: 1000px;
    margin: 30px auto;
    background: #f5f5f5;
}
.header{
    width: 100%;
    height: 200px;
    background: white;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 0 5px #ccc;
}

.header1{
    width: 95%;
    height: 95%;
}
.content{
    width: 100%;
    height: 730px;
    margin-top:20px;
    background:white;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 0 5px #ccc;
}
.content1{
    width: 95%;
    height: 95%;
    overflow: auto;
}